[magick-users] annotating or drawing outside the image?

[duc.sequere.aut.de.via.decede at imagemagick.org]

> But are there any bad side effects of drawing outside the image size?

ImageMagick compares each point against the drawing canvas and if its
outside the region no pixels are modified.  However, the compare operation
can be expensive so the only side-effect to having primitives that are
outside the drawing canvas is perhaps a slight slowdown in drawing speed.